Starting mechanism for pneumatic tools.



' PATENTED APR. 17, 1906,

- R. T. MIOKLE, STARTING MEC'HANISM FOR. PNEUMATIC TOOLS.v APPLICATION FILED SEPT.6,;1901

@.fumsco UNITED STATES PATENT OFFICE.

ROBERT rr. i'iicitLE, OrriiiLeiDnLPHiii. Piixxsi'iivixi-i, Assioxoi: TO RIDGELY AND JoHxsON TOOL COMPANY, .i ooinoita'iiox OF ILLINOIS.

STARTING MECHANISM FOR PNEUMATIC TOOLS.

Specication of Letters Patent.

Patented April 17. 190e.

Application filed September 6,1901. Serial No 74,529.

`Pneumatic Tools,of which 'the following is a specification. y

My invention. relates to pneumatic tools, sucli as are used for chipping, riveting, calliing. and Aanalogous purposes; and it cons ists more especially Ain a novel construction4v of starting mechanisml therefor embodying, broadly, a normally open stop valve or valves and means for actuating said valve or valves and insuring the operationof the tool and the v vreciprocation of the piston therein upon the application of the proper part of the tool to the worlt. I

It also consists of novelidetails of the constructionand arrangement of normally open stop-valves-locatedat 'the front and rear of the. tool and means for effecting the proper operation of said valves and the reciprocationof the piston when the tool is applied to the work.

It further cons ists of novel details of construction. all as will be .hereinafter set forth. Figure 1 represents a longitudinal sectional view of a starting mechanism for a pneumatic tool,l showing the tlirottling devices in their noimally open position. Fig. 2 represents a sectional view siinilarto Fig. 1, but showing the piston and valve in reversed positions and the throttling devices closed or moved into the positions they assume when the tool Ais in operation or pressed to the work. Fig. 3

represents a section on line at :0, Fig. 2.

biinilar numerals of reterence indicate coi'- responding parts in the figures. Referring to the drawings, 1 designates a pneumatic tool comprising the cylinder 2, aving the piston 3 therein and the lhandle 4 secured to said cylinder 'by the preferably lintegral coupling-sleeve 5, within which is the valve-box 6, which contains the distribution*- valve 7, which is held in position by the cap v8. 9 designates the inlet for the motive fluid which passes through the passages 10 11 and port 1.2 of the handle e, said passage 10 being controlled by the throttle-valve 13 and the manually-operated or thumblever 14 in the y manner familiar 'to those skilled in this art.

The particular construction of valve, valvehox, cap, piston',I and ports common to .said piston and valve form per st nopart of my present invention, as the same is applicable to any construction of valve and coactiiig piston, and I have not vdeencd it necessary to describe or show the same in detail except to such extent as I have considered expedient -for a clear',understanding o1' :ily present improvement, although I have sl iu n my invention as'especially applicabli` to ilw well-known "Keller'" pneumatic tool mili. valve mechanism, as exemplified in the laient No.. 647,415, to- Julius Keller;wht-rein l when the parts are in the position' seen in Fig. 1 the motive fluid enters the port .l. passes through the passage 15 of the valve T. and enters the chamber 16 through the -port 17. and passage 1S. Since theport 19 is open to the atmosphere throuvfhthe assage 2U and port 21, the motive lui will gow to the ab mosphere through said port 21, thus rcvent-.

will not take place until said ort 21 is closed bythe rear stop-valve 22, which closing is'ef fected by -the rearward movement of the rod 23, the latter being actuated bythe contact of the shank 24-of the button-set or other working tool 25 with the. movableriiig..sleeve.

or other element 26, the contactof the lattcx with the head -27 of the front stop-valve which is formed ofthe neck 29 and additional head 30, causing Vsaid rod 23 and rear stopvalve 22 to move into the position seen in Fig. 2, the parts assuming this position when the button-set or other Working tool 25 is applied to the work, as is evident. Ifwe as# sume the front and rear stop-valves 22 and 2S to be in t-heposition seen in Fig. land the distribution-valve 7 and piston 3 to be in the position seen in Fi 2, it will be apparentthat4 the' motive lui will flow from the port 1:2 through the,v passages 31, 32, and 33 and port 34 to thefront endof the cylinder, and since the front stop-valve is in theforward osition,

as seen in Fig. 1, said motive fluid wi l flow to,

as seen' in' Fig. 2,'. and" ICO l shank of the Working tool may be varied and of piston 3 and distributionvalve 7-m`odied spirit ofmy invention, an

, proper `or with a lrods 23 of the from its work permits the escape ofthe ino-- tive iuid to the atmosphere and causes the stoppage ofthe tool, said valved passages beingautomatically closed when the working too is pressed to lthe Work. I have not deemed it necessary to describe in 'detail the course of the exhaust from the tool proper, since, as before stated, the same forms lno part of my invention and is fully described 1n the Keller patent above referredto, it being, however, understood thatthe distribution-valve 7, as i vid Keller patent, follows the piston 3.

Thel valves 22av or disconnected from the rod be apparent that the form of said stop-valves may be changed, if desired, and that a plurality of rods 23,'and then. coacting stopvalves,'niay be employed, andl the mecha-nism intermediate the front stop-valve 2S and 23, and it will the construction Without de artingfrom the I therefore reserve to myself the right to make lall such changes as come Within the scope of the same.

It will be apparent that, if desired, I may construct the tool Without the modified construction of nose-piece constructed 'so that the forward end ofthe'hainmer will impact directly upon the object to be struck Without the interpo- Siti-on of the Working tool,.in Which case the by their direct contact with the object to be hammered.

Having thus described my invention, what.

I claim'as new, and desire to secure by Letters Patent. is-

' saidl cylinder', and means the shank of the l. I-n apneumatic tool, a cylinderv having exhaust-ports, a piston therein, a normally open stop-valve 'contained in said cylinder, and ymeans for closing said stop-valvc, and starting saidpiston when 4the Working tool is pressedto the work.

2. In a pneumatic tool, a. cylinder having exhaust-ports, a piston therein, a plurality of normallyopen stop-valves for closing said Working tool is pressed to the Work.

exhaust-ports, a plurality ofmornially open stop-valves and means, operated by pressing Working tool inwardly, for closinlg said valves and starting the tool.

4. n a pneumatic tool, a. cylinder, a piston therein, stop-valve-controlled ports normally open located at each end .of said cylinder and .leading to the atmosphere, andmeans for the Working parts of the tool terposed between said supplemental valve may be connected tol andthe Working tool for closing said valve.

.nose-piece 4 stop-valves may be actuatedv contained in 3. In a pneumatic tool, a4 cylinder having closing. said tive fluid is prevented from escaping freni said body. l

6. In a. pneumatic tool. the continuation of manually-operated throttle-valve control- -li'ng the initial admission of motive fluid to the tool, a's'upplemental normally open valve intermediate the first-mentioned valve and and means inby the act of pressing the tool to its Work.

7. In a pneumatic tool having a graspinghandle secured to its rear end, the combination of a manually-operated-throttle-valve located in said-handle for controlling the ini'- tial admission of a supplemental normally, open stop-valve located Within the body of the tool and operated bythe act of pressingthe tool o its Work, for controlling the after motive fluid has been admitted thereto by the opening of said manually-operated valve.

8. Inra pneumatic tool provided with a motive fluid to the tool andI when the tool is pressed. against operation of the tool grasping-handle at its rear end,'the combinav tion of a manually-operated throttle-valve 'located in said handle for controlling'the initial admission of motive fluid to the tool and a supplemental normallv open stop-valve loloo cated Within the bodyofthe tool and adaptedy to be clos'edby'the act its work, whereby the live motive .fluid is preventedfrom escaping from the working parts of the tool.' i

9- In a pneumatic tool, the lcombination with the Cylinder or'bod.v having a borev at its frontend for the reception of the shank of of pressing the tool to theivorking tool and a `Working tool having its shank inserted in said open stop-valve for preventingr the 'escape of bore, ofa normally the live motive fluid from the cylinder Q f the tool and means intermedia-te said valve and.

the shank of said Working tool whereby the full insertion of said. said valve. I 10. In al pneumatic tool, a cylinder having normally open ports and passages at each end thereof ada ted to permit the escape of live motive fluidp from either end vof the tool, stop-valves controlling said4 ports and passages and means for operating said valves to close said ports and. passages by the act of pressing the tool to its work. -v

ROBERT T. MICKLE. Witnesses: l

E, HAYWARD FAIRBAKS, C. D. MCVAY'.

shank serves to close 

